Commit 636c88da authored Apr 11, 2015 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman May 24, 2015

Drivers: hv: util: introduce state machine for util drivers

KVP/VSS/FCOPY drivers work in fully serialized mode: we wait till userspace
daemon registers, wait for a message from the host, send this message to the
daemon, get the reply, send it back to host, wait for another message.
Introduce enum hvutil_device_state to represend this state in all 3 drivers.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 1d072339

drivers/hv/hyperv_vmbus.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -755,4 +755,13 @@ static inline void hv_poll_channel(struct vmbus_channel *channel,
		cb(channel);
		}

		enum hvutil_device_state {
		HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
		HVUTIL_READY, /* userspace is registered */
		HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
		HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
		HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
		HVUTIL_DEVICE_DYING, /* driver unload is in progress */
		};

		#endif /* _HYPERV_VMBUS_H */